Nonlinear signal‐based control for shake table experiments with sliding masses
Nonlinear signal‐based control for shake table experiments with sliding masses
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DOI：
10.1002/eqe.3852
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发表时间：
2023-03
影响因子：
4.5
通讯作者：
R. Enokida;K. Ikago;Jiayi Guo;K. Kajiwara
中科院分区：
文献类型：
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作者：
R. Enokida;K. Ikago;Jiayi Guo;K. Kajiwara
本研究介绍了非线性信号控制（NSBC）的第一个应用振动台实验与滑动质量。利用非线性信号的NSBC是专门为非线性系统控制而开发的。在钢结构的振动台试验中，即使结构由于其构件的屈服而显示出非线性特性，也能以接近100%的精度在振动台上记录地震加速度。关于严重性，滑动比屈服更强，因为粘着和滑动状态的快速转变。隔震系统是地震工程中的一种重要装置，其滑动作用可用于减轻结构的损伤。然而，当滑动发生在振动台上时，它显著地危及振动台控制。因此，本研究探讨NSBC的表现，振动台实验涉及的现象。首先，本研究探讨NSBC的有效性，通过数值模拟振动台上的滑动界面，证明了卡诺普模型，摩擦系数为0.2。随后，一个线性模型的基础上设计的NSBC的稳定性分析，以评估从不同的模型获得的稳定裕度。实验是通过将重量约为工作台重量两倍的质量放在摩擦系数为0.2-0.4的滑动界面上进行的。在这些实验中，具有合理线性模型设计的NSBC实现了具有足够高精度的预期加速度记录，而基于反演的控制失败了。本研究验证了NSBC的有效性振动台试验与滑动质量。
This study introduces the first application of nonlinear signal‐based control (NSBC) to shake table experiments with sliding masses. NSBC utilising a nonlinear signal was specifically developed for nonlinear system control. In shake table experiments with a steel structure, it realised a seismic acceleration record on the table with near 100% accuracy even when the structure displayed nonlinear characteristics due to yielding of its components. Regarding the severity, sliding is stronger than yielding because of the rapid shifts of stick and slip states. Sliding is utilised for structural damage mitigation in seismic isolation systems, which are prominent devices in earthquake engineering. However, when sliding occurs on a shake table, it significantly jeopardises the table control. Thus, this study investigates the performance of NSBC to shake table experiments involving the phenomenon. First, this study examines the effectiveness of NSBC via numerical simulations on a shake table with a sliding interface, demonstrated by the Karnopp model, with a friction coefficient of 0.2. Subsequently, a linear model is designed based on the stability analysis of NSBC to assess stability margins obtained from different models. Experiments are performed by placing masses weighing approximately twice the table weight on sliding interfaces with friction coefficients of 0.2–0.4. In these experiments, NSBC with a reasonable linear model design realised expected acceleration records with sufficiently high accuracies, whereas inversion‐based control failed. This study verifies the effectiveness of NSBC for shake table experiments with sliding masses.